Chatham Rectangular Alexandrites

Rectangular shaped lab-grown alexandrites

Chatham Alexandrite Crystal

Our selection of Chatham rectangular alexandrites includes emerald cut, radiant cut, baguette alexandrites and antique cushion Chatham alexandrites. Emerald cuts and baguettes have a step cut pavilion. Radiant cuts and antique cushions have a radiant cut pavilion to maximize sparkle and light return. Select the perfect Chatham rectangular alexandrite for you.

Alexandrite, the birthstone for June, is beautifully mysterious. It exhibits the unique phenomenon known as Color Change. Under warm light Chatham created rectangular alexandrites are a reddish-purple while under natural white light they turn a beautiful teal green.

Chatham lab grown rectangular alexandrites exhibit excellent color change because they are grown in a controlled environment in their natural crystal habit, shown left. They are not imitations, rather they are REAL alexandrites carefully grown. Top quality natural alexandrites with excellent color change are rare and extremely expensive. Thankfully, Chatham created alexandrites cost a fraction of the price of mined alexandrites.

Let our graduate gemologist help you

Need help selecting the perfect Chatham rectangular alexandrite? Call our staff gemologist for one-on-one attention you deserve to select the perfect stone. If you don’t see the stone you’re looking for, we can custom cut one to suit your needs. Consider our custom jewelry design and creation services. You’ll work closely with a design consultant to have your gorgeous Chatham rectangular alexandrite mounted in a custom jewelry masterpiece. Call us today at 303-931-3141 for personal assistance.

Louis wanted a hefty alexandrite ring for himself. So we made this stunning 18k gold men’s solitaire ring featuring a 12x10mm Chatham created alexandrite. It shows amazing color change under different lighting. Click the photo to see the video. 

We will price match any legitimate Chatham retailer.

Emerald Cut Antique Cushion Cut Size/Weight Chart

Pictures not actual size. Alexandrite is denser than diamond, so it weighs more for the same physical size. Because carat is a measurement of weight, not size, it’s important to order colored stones based on physical size rather than carat weight.


Click On Your Favorite Alexandrite Shape Or See All Alexandrites Below

Alexandrite is the birthstone for June and is the perfect gift for the 55th wedding anniversary.

Chatham Fancy Cut Alexandrites
Fancy Cut
Chatham Oval Alexandrites
Chatham Rectangular Alexandrite
Chatham Round Alexandrites
Chatham Square Alexandrites
Choose Your Favorite Chatham Created Gems

Chatham round alexandrite


Chatham princess cut aqua spinel

Aqua Spinels

Chatham oval blue sapphire

Blue Sapphires

Chatham Champagne Sapphires

Champagne Sapphires

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Chatham Octagon emerald


Chatham Trillion Padparadscha


Chatham Paraiba Spinel

Paraiba Spinels

Chatham Pink Champagne Sapphire

Pink Champagne Sapphires

Chatham cushion cut pink sapphire

Pink Sapphires

Chatham marquise ruby


Chatham Oval Yellow Sapphire

Yellow Sapphires

Custom Jewelry Services

One-of-a-kind and customizable jewelry pieces

Custom Jewelry Design

One-of-a-kind custom jewelry from scratch.

Custom jewelry design and creation services

Jewelry Gallery

Thousands of customizable jewelry pieces.

Customizable jewelry

Colored and colorless diamonds carefully grown.

Chatham Created Gems

Premium Chatham-created colored gemstones.

We source natural diamonds and gemstones.

Our Work In Madagascar

Changing lives for children and their families

We get our hands dirty!

In 2014 Michelle went to Madagascar to learn about the geology and mineralogy of the country. She was excited to visit some of the mining localities she learned about in her studies to be a Graduate Gemologist. However, it wasn't the sparkly colorful gems that caught her eye. Rather, it was the children...the little gems of Madagascar. Michelle founded in 2015. She visits Madagascar for about two months each year doing humanitarian projects, including clean water, sanitation, education and hygiene.

Little Gems Of Madagascar

What We Do

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